OK, now I see where you going with it. :)
What you want is coming in Cupcake. There is a streaming interface for
audio input and output that gives you an array of audio samples you
can do your signal processing on.
If you need something for SDK 1.0, there is a MediaRecorder function
called getMaxAmplitude(). You should be able to get what you want by
writing the audio file to /dev/null and calling into getMaxAmplitude
periodically. Take a look at the source code for SoundRecorder on
android.git.kernel.org.
On Jan 16, 3:20 pm, "Matt Flax" <flat...@gmail.com> wrote:
> we are implementing a sound level meter. For privacy reasons, we don't want
> the audio lying around on the disk.
>
> We could do it on the fly without recording to disk, however I don't think
> that is possible with the sdk ... is it ?
>
> Matt
>
> On Fri, Jan 16, 2009 at 12:16 PM, Dave Sparks <davidspa...@android.com>wrote:
>
>
>
>
>
> > I am pretty sure that won't work. Why do you want to record a bunch of
> > small audio files without dropping samples?
>
> > On Jan 14, 7:52 pm, flatmax <flat...@gmail.com> wrote:
> > > Hi there,
>
> > > Has anyone managed to record audio to small files without dropping
> > > samples between ?
>
> > > perhaps it is possible to use two recorders which toggle between
> > > recording states ... when on is recording, the other is priming and
> > > waiting to record ...
>
> > > Something like :
>
> > > //declare two recorders
> > > MediaRecorder recorder1 = new MediaRecorder();
> > > MediaRecorder recorder2 = new MediaRecorder();
>
> > > /// continuously prime, start and stop the two streams so one is
> > > always capturing ...
>
> > > //prime and start recorder1 - this is the loop roll in
> > > recorder1.setAudioSource
> > > recorder1.setOutputFormat
> > > recorder1.setAudioEncoder
> > > recorder1.setOutputFile
> > > recorder1.prepare
> > > recorder1.start
>
> > > while (1){
>
> > > //prime and start recording from recorder2
> > > recorder2.setAudioSource
> > > recorder2.setOutputFormat
> > > recorder2.setAudioEncoder
> > > recorder2.setOutputFile
> > > recorder2.prepare
>
> > > //wait a certain ammount of time to allow capture
> > > sleep
>
> > > recorder2.start
>
> > > recorder1.stop
> > > recorder1.reset
>
> > > //prime recorder1
> > > recorder1.setAudioSource
> > > recorder1.setOutputFormat
> > > recorder1.setAudioEncoder
> > > recorder1.setOutputFile
> > > recorder1.prepare
>
> > > //wait a certain ammount of time to allow capture
> > > sleep
>
> > > /// switch recorders
> > > recorder1.start
>
> > > recorder2.stop
> > > recorder2.reset
>
> > > }
>
> > > recorder1.release();
> > > recorder2.release();
>
> --http://www.flatmaxstudios.com
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